// Copyright 2018 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef V8_OBJECTS_PROTOTYPE_INFO_INL_H_
#define V8_OBJECTS_PROTOTYPE_INFO_INL_H_

#include "src/objects/prototype-info.h"

#include "src/heap/heap-write-barrier-inl.h"
#include "src/objects-inl.h"
#include "src/objects/fixed-array-inl.h"
#include "src/objects/map-inl.h"
#include "src/objects/maybe-object.h"
#include "src/objects/struct-inl.h"

// Has to be the last include (doesn't have include guards):
#include "src/objects/object-macros.h"

namespace v8 {
namespace internal {

    OBJECT_CONSTRUCTORS_IMPL(PrototypeInfo, Struct)

    CAST_ACCESSOR(PrototypeInfo)

    Map PrototypeInfo::ObjectCreateMap()
    {
        return Map::cast(object_create_map()->GetHeapObjectAssumeWeak());
    }

    // static
    void PrototypeInfo::SetObjectCreateMap(Handle<PrototypeInfo> info,
        Handle<Map> map)
    {
        info->set_object_create_map(HeapObjectReference::Weak(*map));
    }

    bool PrototypeInfo::HasObjectCreateMap()
    {
        MaybeObject cache = object_create_map();
        return cache->IsWeak();
    }

    ACCESSORS(PrototypeInfo, module_namespace, Object, kJsModuleNamespaceOffset)
    ACCESSORS(PrototypeInfo, prototype_users, Object, kPrototypeUsersOffset)
    WEAK_ACCESSORS(PrototypeInfo, object_create_map, kObjectCreateMapOffset)
    SMI_ACCESSORS(PrototypeInfo, registry_slot, kRegistrySlotOffset)
    SMI_ACCESSORS(PrototypeInfo, bit_field, kBitFieldOffset)
    BOOL_ACCESSORS(PrototypeInfo, bit_field, should_be_fast_map, kShouldBeFastBit)

    void PrototypeUsers::MarkSlotEmpty(WeakArrayList array, int index)
    {
        DCHECK_GT(index, 0);
        DCHECK_LT(index, array->length());
        // Chain the empty slots into a linked list (each empty slot contains the
        // index of the next empty slot).
        array->Set(index, MaybeObject::FromObject(empty_slot_index(array)));
        set_empty_slot_index(array, index);
    }

    Smi PrototypeUsers::empty_slot_index(WeakArrayList array)
    {
        return array->Get(kEmptySlotIndex).ToSmi();
    }

    void PrototypeUsers::set_empty_slot_index(WeakArrayList array, int index)
    {
        array->Set(kEmptySlotIndex, MaybeObject::FromObject(Smi::FromInt(index)));
    }

} // namespace internal
} // namespace v8

#include "src/objects/object-macros-undef.h"

#endif // V8_OBJECTS_PROTOTYPE_INFO_INL_H_
